Updated Oct 2026 · By ACME Construction
Construction manager at risk vs design build is a choice between two ways to bring the builder in early. With CMAR, you hire the designer and the builder under separate contracts. With design-build, one team designs and builds under a single contract, so you have one point of responsibility.
Most owners know they want the builder involved early. Early input catches cost problems, keeps the schedule real and cuts down on redesign. The harder question is how to set up the contracts. Two methods do this well, and they work in very different ways. This guide compares construction manager at risk vs design build for projects in Oklahoma City, Edmond, Norman, Moore and Yukon.
If you are still deciding between design-build and the traditional design-bid-build route, start with our guide to design-build vs traditional construction. That post covers the basics. This one picks up where it leaves off. It is for owners who already want early builder input and need to choose between the two methods that offer it.
Construction Manager at Risk vs Design Build: The Short Version
Both methods bring the builder to the table before the design is done. The difference is who you sign with and who answers for the design.
- Construction manager at risk (CMAR or CMR): You hire an architect or engineer to design the project. You also hire a construction manager early, under a separate contract. The construction manager gives cost and schedule advice during design. Later, it commits to a guaranteed maximum price (GMP) and builds the project.
- Design-build (DB): You sign one contract with a design-build team. That team handles both design and construction. If something in the plans does not work in the field, the same team owns the fix.
In short, CMAR keeps the designer working for you. Design-build puts the designer and builder on the same side of the table.
How Construction Manager at Risk Works
A CMAR contract usually has two phases. In the first phase, the construction manager provides preconstruction services. That means estimates, schedules, constructability reviews and advice on materials and systems. You pay a fee for this work.
In the second phase, the construction manager sets a guaranteed maximum price and takes on the risk of building the job for that price. The word “at risk” means just that. If costs run over the GMP for reasons inside the construction manager’s control, the construction manager generally covers the difference.
Oklahoma’s state rules show how this works on public projects. Under Oklahoma Administrative Code 260:65-17-9, the GMP on state construction management jobs should be set when drawings and specifications are about 95% complete. When the GMP is approved, the construction manager must furnish 100% performance, payment and defect bonds equal to the GMP. The same rule says the construction manager may bid on parts of the work itself, but only under the same terms as other bidders. Trade work is then awarded to the lowest responsible bidder.
Private owners are not bound by those state rules, but they show the logic of the method. The owner holds the design contract. The construction manager holds the price.
How Design-Build Works
With design-build, you start by defining what you need. That may be a program, a budget, a site and a target date. Then you hire one team to deliver it. The design-builder may have designers on staff or may hire an architect as part of its team.
Because one team controls both design and construction, work can overlap. Site work, foundations or long-lead orders can begin while later design packages are still being finished. Questions between the designer and the builder get settled inside the team instead of landing on your desk as a change order.
The trade-off is control. You give up some direct say over design details, since the designer does not work for you. Many owners handle this by writing clear performance requirements and keeping the right to review and approve design at set milestones.
Side-by-Side Comparison
| Factor | Construction Manager at Risk | Design-Build |
|---|---|---|
| Contracts | Two: designer and construction manager | One: design-build team |
| Who the designer works for | The owner | The design-builder |
| When the price is fixed | GMP late in design | Often earlier, based on the owner’s program |
| Owner control of design | High | Lower, set by requirements and reviews |
| Single point of responsibility | No | Yes |
| Overlap of design and construction | Some | Most |
What the Research Says About Cost and Speed
The best-known study of delivery methods comes from the Construction Industry Institute and the Charles Pankow Foundation. Researchers Keith Molenaar and Bryan Franz looked at 212 U.S. building projects completed between 2008 and 2013. According to the Design-Build Institute of America’s summary, 53 were design-bid-build, 79 were CMR and 80 were design-build. About 62% were publicly funded and 38% were privately funded.
Here is how design-build compared with CMR in that sample:
- Design-build cost 1.9% less per square foot than CMR.
- Design-build had 2.4% less cost growth than CMR.
- Design-build had 3.9% less schedule growth than CMR.
- Design-build was 13% faster during construction.
- From design through completion, design-build was 61% faster than CMR.
CMR still beat the traditional route on speed. The full report, Revisiting Project Delivery Performance, found CMR projects were about 20% faster in construction and 25% faster overall than design-bid-build. CMR did cost 1.6% more per square foot than design-bid-build, but it had 1.4% less cost growth.
Keep these numbers in context. DBIA is a trade group that promotes design-build, and its director put the findings this way:
“Whether it’s a billion-dollar airport or small community library, this research confirms design-build continues to deliver innovative projects that save time and money.” — Lisa Washington, CAE, Executive Director/CEO, Design-Build Institute of America
The researchers also found that the method was not the only thing that mattered. Team chemistry, open-book terms such as a GMP and earlier builder involvement all helped control cost growth. A well-run CMAR job with a strong team can beat a poorly run design-build job.
When Construction Manager at Risk Makes Sense
CMAR tends to fit owners who want to keep a close hand on design. Consider it when:
- You already have an architect you trust and want to keep working with.
- Design quality, finishes or image matter a great deal, as with a headquarters, school or public building.
- Your board or funding source wants the designer to report straight to you.
- The scope is likely to change during design, and you want time to make choices before the price is locked.
- You want open-book pricing so you can see the trade bids that make up the GMP.
CMAR also works well on renovations of occupied buildings. A construction manager on board early can walk the building, plan phasing and flag hidden conditions before the design is final.
When Design-Build Makes Sense
Design-build tends to fit owners who care most about speed and want one party to answer for the result. Consider it when:
- Your schedule is tight, such as a store opening, a lease date or a production line.
- The building type is well understood, like a warehouse, shop, office shell or metal building.
- You have limited staff to manage two contracts and the gap between them.
- You can describe what you need in clear performance terms.
- You want fewer disputes over whether a problem is a design issue or a construction issue.
For more on how one-contract delivery compares with hiring a general contractor, see our post on choosing a general contractor or design-build in OKC.
Questions to Ask Before You Choose
- How much design control do I need? If you want to approve details as they develop, lean toward CMAR.
- How firm is my scope? A clear scope suits design-build. A scope still taking shape may suit CMAR.
- When do I need a firm price? CMAR fixes the price late in design. Design-build can often commit earlier.
- How many contracts can my team manage? One contract is simpler for a small owner team.
- Am I spending public money? Public owners must follow the rules that apply to them. Check before you pick a method.
Public Projects in Oklahoma
Public owners have less freedom than private ones. Under Oklahoma statute Title 61, Section 202.1, state agency projects, and projects where the Legislature specifies design-build or at-risk construction management, need written approval from the OMES Director. The same section says these methods may not keep subcontractors and trade contractors from competing openly under the Public Competitive Bidding Act of 1974.
Cities, schools and other public bodies may have their own rules. If you are a public owner, talk to your legal counsel before you choose a method.
How the Guaranteed Maximum Price Works
The GMP is the heart of a CMAR contract. It caps what you will pay for the defined scope. It usually includes the cost of the work, the construction manager’s fee, general conditions and a contingency.
A few points help owners avoid surprises:
- Know what is in the contingency. Ask who controls it and what happens to unused funds.
- Watch the design stage. A GMP set on incomplete drawings may include more allowances and assumptions.
- Read the exclusions. Anything left out of the GMP can come back as a change order.
- Ask about shared savings. Some contracts split money left under the GMP between the owner and the construction manager.
Design-build contracts can also use a GMP. The difference is that the design-builder sets the price while it also controls the design.
Two Example Scenarios
These made-up examples show how the choice can play out. They are not real projects.
Scenario one: a school addition. A school board already works with an architect it trusts. The board wants to approve classroom layouts, finishes and colors. Funding comes from a bond, so the board needs a firm cap before it signs. CMAR fits well here. The architect keeps working for the board, and the construction manager joins early to check costs and plan work around the school year.
Scenario two: a warehouse for a growing business. A distributor needs a metal building on a new lot in less than a year. It knows the size, dock count and clear height it needs. It has a small staff and no architect on call. Design-build fits well here. One team can design the shell, order steel early and start site work while the final details are drawn.
Both owners want early builder input. They pick different methods because their needs are different.
Choosing a Project Delivery Method Step by Step
Picking a project delivery method does not need to be hard. Write down your top three goals, such as speed, design control or price certainty. Rank them. Then match them to the method that serves the top goal best. If you are comparing firms for each approach, such as a general contractor Oklahoma City owners already use, ask each firm which method it has used most and to share recent examples.
Common Mistakes With Either Method
- Picking on fee alone. A low fee does not mean a low final cost. Look at the team’s experience and track record.
- Bringing the builder in too late. Both methods lose value if the builder joins after the design is mostly done.
- Vague requirements. In design-build, unclear goals lead to a building that meets the contract but not your needs.
- Weak owner staffing. The research found that turnover and understaffing were common on the worst projects.
- Poor communication. Set regular meetings and clear decision deadlines from the start.
Construction Manager at Risk vs Design Build in Oklahoma City
Local conditions matter in Oklahoma City. Clay soils, spring storms and summer heat can affect foundations, site work and outdoor schedules. With either method, early builder input helps plan for weather, order materials on time and set a realistic schedule.
Smaller commercial jobs in Oklahoma City, Edmond and Moore often favor design-build for its speed and simple contract. Larger or more complex buildings, or projects for owners with a set design team, often favor CMAR. Neither is right for every job. The best choice depends on your scope, schedule, budget and how involved you want to be.
Key Facts
- CMAR uses two contracts. Design-build uses one.
- In CMAR, the construction manager commits to a guaranteed maximum price during design.
- Oklahoma’s state rule says the GMP should be set at about 95% completion of drawings on state jobs.
- In the CII/Pankow study of 212 projects, design-build was 61% faster than CMR from design through completion.
- CMR was about 25% faster overall than design-bid-build in the same study.
Frequently Asked Questions
Is construction manager at risk the same as a general contractor?
Not quite. A general contractor on a traditional job is usually hired after design, often by low bid. A construction manager at risk is hired during design, gives advice and then guarantees a price.
Which method is faster?
In the CII/Pankow study, design-build was faster than CMR both during construction and overall. Your results will depend on your project and team.
Which gives the owner more control?
CMAR usually does, because the designer works directly for the owner.
Can a private owner in Oklahoma use either method?
Yes. Private owners can choose the method that fits their project. Public owners must follow the rules that apply to them.
Is a guaranteed maximum price a fixed price?
It is a cap, not a fixed price. If costs come in under the GMP, the savings may go back to the owner or be shared, depending on the contract.
About ACME Construction
ACME Construction provides general contracting and commercial contracting across Oklahoma City, Edmond, Norman, Moore and Yukon. Our work includes concrete, metal work and remodeling for business owners and property managers.
Conclusion
Construction manager at risk vs design build comes down to control versus speed. CMAR keeps the designer working for you and fixes the price later. Design-build gives you one team, one contract and, in the research, faster delivery. Both beat waiting until the design is done to bring in a builder. To talk through your project, call ACME Construction at 405-451-4555, email support@acmeok.com or contact us.